<form method="get" id="searchform" action="<?php bloginfo('home'); ?>/">

<div>

	<input type="text"  onkeydown="if (event.keyCode==13) {}" onblur="if(this.value=='')value='请填写搜索内容';" onfocus="if(this.value=='请填写搜索内容')value='';" value="请填写搜索内容" value="<?php echo wp_specialchars($s, 1); ?>" name="s" id="s" size="15" />

	<input type="image" id="go" src="<?php bloginfo('template_url'); ?>/images/btn_search_box.gif" width="24" height="24" alt=""  />

</div>

</form>